Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual modelo possui comentários de daggerboards curvos. design: morelli und melvin?
 ###Tabelas: CREATE TABLE sixth_round (sixth_round_id AUTO_INCREMENT PRIMARY KEY, Pick INT, Team VARCHAR, Player VARCHAR, Position VARCHAR, College VARCHAR) CREATE TABLE tour_de_france_stage_finishes (tour_de_france_stage_finishes_id AUTO_INCREMENT PRIMARY KEY, Year INT, Stage INT, Start of stage VARCHAR, Distance (km) VARCHAR, Category VARCHAR, Stage winner VARCHAR, Yellow jersey VARCHAR) CREATE TABLE physical_composition (physical_composition_id AUTO_INCREMENT PRIMARY KEY, Size VARCHAR, Density VARCHAR, Tracks INT, Coercivity VARCHAR, Unformatted capacity per side VARCHAR) CREATE TABLE 1972_isle_of_man_ultra-lightweight_tt_125cc_final_standings (1972_isle_of_man_ultra-lightweight_tt_125cc_final_standings_id AUTO_INCREMENT PRIMARY KEY, Place INT, Rider VARCHAR, Country VARCHAR, Machine VARCHAR, Speed VARCHAR, Time VARCHAR, Points INT) CREATE TABLE current_and_notable_past_models (current_and_notable_past_models_id AUTO_INCREMENT PRIMARY KEY, Model VARCHAR, Length Over All VARCHAR, Beam VARCHAR, Sail Area VARCHAR, Crew VARCHAR, Comments VARCHAR)  
SELECT Model FROM current_and_notable_past_models WHERE Comments = curved daggerboards. design: morelli und melvin